<template>
  <div class="spec-preview">
    <img :src="currentImg || defaultList.imgUrl" />
    <div class="event"></div>
    <div class="big">
      <img :src="currentImg || defaultList.imgUrl" />
    </div>
    <div class="mask"></div>
  </div>
</template>

<script>
import {
  computed,
  getCurrentInstance,
  onBeforeUnmount,
  onMounted,
  ref,
} from '@vue/runtime-core'
export default {
  name: 'Zoom',
  props: ['imgList'],
  setup(props) {
    const defaultList = computed(() => {
      return props.imgList[0] || {}
    })
    //$bus 控制当前的img
    let currentImg = ref('')
    const $bus = getCurrentInstance().appContext.config.globalProperties.$bus
    onMounted(() => {
      $bus.on('getCurrentImg', (url) => {
        currentImg.value = url
      })
    }),
      onBeforeUnmount(() => {
        $bus.off('getCurrentImg')
      })
    return { defaultList, currentImg }
  },
}
</script>

<style lang="less">
.spec-preview {
  position: relative;
  box-sizing: border-box;
  width: 400px;
  height: 400px;
  border: 1px solid #ccc;

  img {
    width: 100%;
    height: 100%;
  }

  .event {
    width: 100%;
    height: 100%;
    position: absolute;
    top: 0;
    left: 0;
    z-index: 998;
  }

  .mask {
    width: 50%;
    height: 50%;
    background-color: rgba(0, 255, 0, 0.3);
    position: absolute;
    left: 0;
    top: 0;
    display: none;
  }

  .big {
    width: 100%;
    height: 100%;
    position: absolute;
    top: -1px;
    left: 100%;
    border: 1px solid #aaa;
    overflow: hidden;
    z-index: 998;
    display: none;
    background: white;

    img {
      width: 200%;
      max-width: 200%;
      height: 200%;
      position: absolute;
      left: 0;
      top: 0;
    }
  }

  .event:hover ~ .mask,
  .event:hover ~ .big {
    display: block;
  }
}
</style>
